Giant Airspace and shorter killstreaks mod

Hi everyone.

I was playing MW2 the other day, and i was wondering...is there a way to edit the aerial killstreaks (specifically, the Ac-130, Attack helicopter, Pavelow, Chopper gunner, Harrier strike, Stealth bomber, and presicion airstrike) to be about 4 kills each to obtain, and make the airspace massive so that there could be multiple helis and others in the air on each side at the same time?

I just want to use this so i can have an air warfare match with me and my friend in a private match.